It's over folks. The entire Milky Way is ours. No Spock, no ET, no man of steel, no intelligent cabbage that squawks when kicked. Distant past separated by billions of years at best or evolved billions of years from now (when Andromeda hits us). Anything that might have been alien grays is long dead, or too evolved to use space ships.
Maybe there is intelligent or any life in distant galaxies. We will never meet those species. Too far.
Now I discover that not only was Earth seeded with primordial chemicals from Mars rocks created by an early collision, but our solar system itself could not have been created without the Milly Way eating part of Sagittarius dwarf galaxy as it spiraled through us a first, second and third time. Still doing so but human life as damage is done. Singular blue marble. Only alien life will be us, if we move away and venture back.
Goldilocks zone starts further out and moves inward. We need one planet to make life and another to capture that early baked goo. Plus, our star is young compared to most of Milky Way, because we got extra gas from the visitor stars. We arrived at the ballpark, ready to play a game that expired ten billions years ago.
Enjoy the Milky Way (distant voyagers from Earth) -- It's all ours.